Telecommunications terms starting with O

263 terms

ordinary ray See birefringence.
Organizer Any person who discovers, creates, investigates, or initiates the tax shelter investment, devises the business or financial plans for the investment or…
originating connection The connection between the termination of a user-network interface and an operator service access point that is used for communication between the user…
originating endpoint In a wideband packet node, the point that receives channelized traffic, packetizes it, and sends it into the wideband packet network. [T1.509-1995]
originating line information (OLI) Information indicating a toll class of service for the call. [T1.667-1999]
originating line-side access The ability to dial the appropriate 7- or 10-digit test number from a subscriber line. [T1.207-2000]
originating point code (OPC) A part of the routing label in a signaling message that uniquely identifies the originating point of that signaling message in a signaling network. [T1.
originating trunk-side access The ability to dial the appropriate test line number with trunk access using the appropriate test equipment. [T1.207-2000]
originating user The user that initiates a particular information transfer transaction. Note: The originating user may be either the source user or the destination user.
origination network The signaling network that initiates a non-circuit-related message containing intermediate signaling network indication (ISNI) information; this network…
originator The acronym for the agency that is the original source of the data. The source for nearly all map layers created by OCTO that are not part of the…
originator-to-recipient speed of service Synonym speed of service.
orthogonal multiplex A method of combining two or more digital signals that have mutually independent pulses, thus avoiding intersymbol interference.
orthogonal sampling In digital video, a sampling where the luminance and the color-difference samples are generated from pixels arranged in common, continuous vertical and…
orthomode transducer A device forming part of an antenna feed and serving to combine or separate orthogonally polarized signals.
oscillator An electronic circuit designed to produce an ideally stable alternating voltage or current.
OSI Operator System Interface.
OSI--RM Abbreviation for Open Systems Interconnection--Reference Model.
OTAR Abbreviation for over-the-air rekeying.
OTDR Optical Time-Domain Reflectometer .
other common carrier (OCC) A communications common carrier--usually an interexchange carrier--that offers communications services in competition with AT&T and/or the established U.S.
out call A universal personal telecommunications (UPT) call type that permits a UPT user to make calls from any terminal on any network, and have access to his/her…
out-call registration A feature that enables the universal personal telecommunications (UPT) user to register for outgoing calls from the current terminal address to allow…
out-of-area An area not included in the subscribed service. An area may be defined in terms of a state/province, NPA, LATA, etc. [T1.207-1998]
out-of-band emission Emission on a frequency or frequencies immediately outside the necessary bandwidth which results from the modulation process, but excluding spurious…
out-of-band notification In encryption, notification using a communication means other than the primary communication means. [After X9.49]
out-of-band signaling Signaling that uses a portion of the channel bandwidth provided by the transmission medium, e.g.
out-of-frame-alignment time The time during which frame alignment is effectively lost. Note: The out-of-frame-alignment time includes the time to detect loss of frame alignment and…
out-slot signaling Signaling performed in digital time slots that are not within the channel time slot.
Outage A discontinuance of electric power supply.
outage duration That period of time between the onset of an outage and the restoration of service.
outage probability The probability that an outage will occur within a specified time period.
outage ratio The sum of all the outage durations divided by the time period of measurement.
outage state See outage.
outage threshold For a supported performance parameter of a system, the value that establishes the minimum performance level at which the system is considered to remain in…
outgoing access The ability of a user to originate data calls via an ISDN. [T1.615-1992]
outpulsing The process of transmitting address information over a trunk from one switching center or switchboard to another.
output 1. Information retrieved from a functional unit or from a network, usually after some processing. 2. An output state, or sequence of states. 3.
output angle Synonym radiation angle.
output rating The expression of the stated power available at the output terminals of a transmitter when connected to the normal load or its equivalent. 2.
outside plant 1. In telephony, all cables, conduits, ducts, poles, towers, repeaters, repeater huts, and other equipment located between a demarcation point in a…
outward dialing See direct outward dialing.
ovality The attribute of an optical fiber, the cross section of the core or cladding of which deviates from a perfect circle. 2.
over-the-air key distribution Providing electronic key via over-the-air rekeying, over-the-air key transfer, or cooperative key generation. [INFOSEC-99]
over-the-air key transfer Electronically distributing key without changing traffic encryption key used on the secured communications path over which the transfer is accomplished.
over-the-air rekeying (OTAR) Changing traffic encryption key or transmission security key in remote crypto -equipment by sending new key directly to the remote crypto-equipment over…
over-the-horizon radar A radar system that makes use of the atmospheric reflection and refraction phenomena to extend its range of detection beyond line of sight.
overfill The condition that prevails when the numerical aperture of an optical source, such as a laser, light-emitting diode, or optical fiber, exceeds that of the…
overflow In telephony, the generation of potential traffic that exceeds the capacity of a communications system or subsystem. 2.
overhead bit Any bit other than a user information bit.
overhead communications See overhead bit.
overhead information Digital information transferred across the functional interface between a user and a telecommunications system, or between functional units within a…
overlap pulsing An arrangement for exchange-carrier-to-interexchange carrier (EC-to-IC) outpulsing that allows seizure of the EC-to-IC trunk and initiation of outpulsing…
overlay See topological overlay.
overlay cell A larger cell that physically overlays one or more smaller cells. For example, intra-building cells may be encompassed by a larger campus cell. [T1.
Overload To exceed the design capacity of a device.
overload point Synonym load capacity.
overmodulation The condition that prevails when the instantaneous level of the modulating signal exceeds the value necessary to produce 100% modulation of the carrier.
override To preempt, manually or automatically, a prescribed procedure. Note: For example, one might manually override a prescribed course of action programmed to…
overshoot That portion of an arc digitized past its intersection with another arc. See also dangling arc.
overt channel [A] Communications path within a computer system or network designed for the authorized transfer of data. [INFOSEC-99]
overtone Of a sinusoidal wave, an integral multiple of the frequency, i.e., the fundamental, of the wave, other than the fundamental itself.
overwrite procedure [The] Process of writing patterns of data on top of the data stored on a magnetic medium. [INFOSEC-99]